The moisture equivalent of heavy soils
The moisture equivalent of heavy soils
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重土的水分当量
DOI：
10.1017/s002185960000321x
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发表时间：
1923
期刊：
影响因子：
--
通讯作者：
F. J. Martin
中科院分区：
文献类型：
--
作者：
A. F. Joseph;F. J. Martin
(1)正常土壤的水分当量随着测定土壤重量的增加而减少。(2)有些土壤在较厚的土层中特别不透水：在这种情况下，水分当量随着土壤的重量增加而增加，并可能由于内涝而变得很大。然而，土壤可能具有非常高的水分当量而不显示涝渍。(3)硫酸钙、硝酸铵或硫酸铵等絮凝盐的稀释溶液降低水分当量，碳酸钠增加水分当量。(4)碳酸钠的作用比较复杂，随着浓度的逐渐增加，水分当量先减小后增大到最大值，之后又进一步减小。(5)在布里格斯-麦克莱恩装置中，容易发生涝渍的土壤样品的羟基离子（pH）浓度高于不容易发生涝渍的土壤样品。(6)虽然粘土的胶体含量似乎与其水分当量有关，但高岭土或氢氧化铝等物质似乎没有这种联系。
(1) The moisture equivalent of a normal soil diminishes as the weight of soil taken for the determination increases. (2) Some soils are particularly impermeable to water in thick layers: in these cases the moisture equivalent increases with the weight of soil taken and may become very large owing to waterlogging. A soil may, however, have a very high moisture equivalent without showing waterlogging. (3) Dilute solutions of flocculating salts such as calcium sulphate, or ammonium nitrate or sulphate, reduce the moisture equivalent, and sodium carbonate increases it. (4) The effect of sodium carbonate is complicated: with gradually increasing concentration, the moisture equivalent first diminishes and then increases to a maximum, after which there is further diminution. (5) The soil samples which easily showed waterlogging in the Briggs-McLane apparatus had a higher concentration of hydroxyl-ions (pH) than those which did not. (6) Whilst the colloidal content of a clay seems related to its moisture equivalent, no such connection appears to exist for substances such as kaolin or aluminium hydroxide.